| Geological correlation between Thailand and West Yunnan based
on the Paleo-Tethyan radiolarian bearing rocks |
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| Geological correlation between Thailand and West Yunnan basedon the Paleo-Tethyan radiolarian bearing rocks |
| In the last decade, radiolarian biostratigraphy has clarified the ages of siliceous sedimentary rocks in vari-ous parts of Thailand (e.g., Sashida et al., 1993; Ka-mata et al., 2002; Wonganan and Caridroit, 2005). These age determinations have yielded not only new litho- and chronostratigraphic interpretations, but also data on the time duration and spatial distribution of the Paleo-Tethys and its associated seaways. Recently, Kamata et al. (2009) has classify the chert into two types of “pelagic” and “hemipelagic” based on lithol-ogy, faunal content, and stratigraphy in Thailand, and presumed that the pelagic environments of the Pa-leo-Tethys would have been suitable for the deposi-tional site for the former whereas the vicinity of a continental slope and rise located in the eastern margin of the Sibumasu would have been suitable for the latter. Kamata et al., (2009) also clarified that the hemipale-gic and pelagic cherts are exposed in two north- trending zones. The western zone includes the hemipelagic chert, as well as glaciomarine and other Paleozoic to Mesozoic successions, overlying a Pre-cambrian basement of Sibumasu elements. The eastern zone contains pelagic chert and limestone and should be correlated to the Inthanon Zone (Ueno, 1999; 2002). The Inthanon zone is characterized by the presence not only of Paleo-Tethyan sedimentary rocks, but also of Sibumasu elements that structurally underlie the Pa-leo-Tethyan rocks. The boundary between the Sibu-masu and Paleo-Tethys zones is a north-trending, low-angle thrust that resulted from the collision of the Sibumasu and Indochina Blocks (Ueno, 2002; Kamata et al., 2009) |
| Yoshihito KAMATA.2009.Geological correlation between Thailand and West Yunnan basedon the Paleo-Tethyan radiolarian bearing rocks[J].Acta Geoscientica Sinica,30(S1):19-20. |
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